its possible to diy but youre working a high voltage device that could very easily seriously injure or even kill you unless you take precautionary steps like the one hand rule discharging the capacitors and such its certainly not impossible to diy do you know that it is the output tranny alone that is bad there can be secondary causes to transformer failure the folks over rtoobamps ought to be able to get you a bit more of the specialized help youre looking for than here